Final answer:
Lifeguards should always be attentive and sit or stand upright, keep a cell phone in their hip packs, and assist patrons with swim testing when on surveillance duty.
Step-by-step explanation:
The lifeguards should always be attentive and sit or stand upright when on surveillance duty.
This is important because it allows them to have a clear view of the swimming area and quickly respond to any emergencies. They should also keep a cell phone in their hip packs at all times, in case of emergency.
This ensures that they can easily call for help if needed. Lastly, lifeguards should assist patrons with swim testing when on surveillance duty.
This helps to ensure that swimmers are in areas that match their abilities and reduces the risk of accidents.